//$Id: dateformat.js,v 1.3 2006/05/02 18:02:09 diegor Exp $
//To date   <input type=text name=to   onBlur="checkdate(this)" size=11
function checkdate(objName) {
var datefield = objName;
if (chkdate(objName) == false) {
datefield.select();
alert("That date is invalid.  Please try again.");
datefield.focus();
return false;
}
else {
return true;
   }
}
function chkdate(objName) {
var strDatestyle = "US"; //United States date style
//var strDatestyle = "EU";  //European date style
var strDate;
var strDateArray;
var strDay;
var strMonth;
var strYear;
var intday;
var intMonth;
var intYear;
var booFound = false;
var datefield = objName;
var strSeparatorArray = new Array("-"," ","/",".");
var intElementNr;
var err = 0;
var d = new Date()
var strMonthArray = new Array(12);
strMonthArray[0] = "01";
strMonthArray[1] = "02";
strMonthArray[2] = "03";
strMonthArray[3] = "04";
strMonthArray[4] = "05";
strMonthArray[5] = "06";
strMonthArray[6] = "07";
strMonthArray[7] = "08";
strMonthArray[8] = "09";
strMonthArray[9] = "10";
strMonthArray[10] = "11";
strMonthArray[11] = "12";
strDate = datefield.value;
if (strDate.length < 1) {
return true;
}

for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {

if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {

        strDateArray = strDate.split(strSeparatorArray[intElementNr]);

//alert(strDateArray.length)
        if ((strDateArray.length <  2) || (strDateArray.length > 3)) {
                err = 1;
                return false;
        }else if (strDateArray.length == 3){

                strDay = strDateArray[0];
                strMonth = strDateArray[1];
                strYear = strDateArray[2];
        } else {

                strDay = strDateArray[0];
                strMonth = strDateArray[1];
                strYear = d.getFullYear();
        }

        booFound = true;
}

}


if (booFound == false) {
if (strDate.length>5) {
strDay = strDate.substr(0, 2);
strMonth = strDate.substr(2, 2);
strYear = strDate.substr(4);
   }
}
if (strYear.length == 2) {
strYear = '20' + strYear;
}
// US style
if (strDatestyle == "US") {
strTemp = strDay;
strDay = strMonth;
strMonth = strTemp;
}
intday = parseInt(strDay, 10);
//intday = strDay;
if (isNaN(intday)) {
err = 2;
return false;
}
intMonth = parseInt(strMonth, 10);
if (isNaN(intMonth)) {
for (i = 0;i<12;i++) {
if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) {
intMonth = i+1;
strMonth = strMonthArray[i];
i = 12;
   }
}
if (isNaN(intMonth)) {
err = 3;
return false;
   }
}
intYear = parseInt(strYear, 10);
if (isNaN(intYear)) {
err = 4;
return false;
}
if (intMonth>12 || intMonth<1) {
err = 5;
return false;
}
if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) {
err = 6;
return false;
}
if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) {
err = 7;
return false;
}
if (intMonth == 2) {
if (intday < 1) {
err = 8;
return false;
}
if (LeapYear(intYear) == true) {
if (intday > 29) {
err = 9;
return false;
}
}
else {
if (intday > 28) {
err = 10;
return false;
}
}
}

if (strDatestyle == "US") {

datefield.value = strMonthArray[intMonth-1] + "-" + intday+"-" + strYear;
}

else {

datefield.value = intday + "-" + strMonthArray[intMonth-1] + "-" + strYear;

}

return true;

}
function LeapYear(intYear) {
if (intYear % 100 == 0) {
if (intYear % 400 == 0) { return true; }
}
else {
if ((intYear % 4) == 0) { return true; }
}
return false;
}


function reformat(d){

var strMonthArray = new Array(12);
strMonthArray[0] = "Jan";
strMonthArray[1] = "Feb";
strMonthArray[2] = "Mar";
strMonthArray[3] = "Apr";
strMonthArray[4] = "May";
strMonthArray[5] = "Jun";
strMonthArray[6] = "Jul";
strMonthArray[7] = "Aug";
strMonthArray[8] = "Sep";
strMonthArray[9] = "Oct";
strMonthArray[10] = "Nov";
strMonthArray[11] = "Dec";

strDateArray = d.split("-");

strDay = strDateArray[0];
strMonth = strDateArray[1];
strYear = strDateArray[2];

//alert(strMonthArray[strDay-1] + " " + strMonth+" " + strYear);

return strMonthArray[strDay-1] + " " + strMonth + " " + strYear;

}



//<input type=button name=formatbutton onClick="doDateCheck(this.form.from, this.form.to);" value="Check">

function doDateCheck(from, to) {

if (Date.parse(reformat(from.value)) >  Date.parse(reformat(to.value))) {
alert("To date must occur after the from date.");
return false;
}
//else {
//if (from.value == "" || to.value == "")
//alert("Both dates must be entered.");
else{
alert("To date must occur after the from date.");
  }
}
